Application Scope

The RMM1LE series residual current circuit breakers (hereinafter referred to as circuit breakers) are suitable for AC 50/60Hz power systems with a rated working voltage up to 400V and a rated working current from 16A to 630A. They are used for direct grounding of the power supply neutral point in supply and demand systems for leakage protection. They can also prevent fire hazards caused by grounding fault currents due to equipment insulation damage. Additionally, they can be used for power distribution and protection of circuits and power equipment against damage from overloads, short circuits, and other faults, and can serve as infrequent start and overload/short circuit protection for motors.

This leakage circuit breaker features a compact size (equal to that of the corresponding plastic-case circuit breaker), high breaking capacity, short arc, and adjustable residual operating current. Additionally, it can be equipped with accessories such as alarm contacts, separate release coils, and auxiliary contacts, making it an ideal product for user applications. The leakage circuit breaker can be vertically installed (upright) or horizontally installed (sideways).

This product complies with GB14048.2 and IEC60947-2 standards.

Structure and Working Principle

·This series of residual current circuit breakers is an electronic type, primarily composed of a zero-sequence transformer, an electronic control trip unit, and a circuit breaker with overload and short-circuit protection. All components are housed within a plastic casing.

·In the event of leakage or electric shock in the protected circuit, once the residual current reaches the set trip current value, the output signal of the secondary winding of the zero-sequence transformer triggers the thyristor to conduct, and the leakage circuit breaker operates through the leakage release, thereby cutting off the power and providing protection against leakage and electric shock.

·Upon overload or short-circuit of the protected circuit, the dual-trip device initiates a delayed or instantaneous trip action, causing the leakage circuit breaker to operate and thereby cutting off the power to provide overload or short-circuit protection.